MANUFACTURING METHOD OF BORON NITRIDE NANOMATERIAL AND BORON NITRIDE NANOMATERIAL, MANUFACTURING METHOD OF COMPOSITE MATERIAL AND COMPOSITE MATERIAL, AND METHOD OF PURIFYING BORON NITRIDE NANOMATERIAL
Provided is a method of manufacturing a boron nitride nanomaterial, in which boron can be removed more certainly from a boron nitride composition comprising boron that is manufactured using, for example, the thermal plasma vapor growth method. One aspect of the method of manufacturing a boron nitride nanomaterial comprises: a nanomaterial producing step of producing a boron nitride nanomaterial in which a boron grain(s) is included in a boron nitride fullerene; an oxidation treatment step of forming boron oxide on at least a surface layer of the boron grain(s) by exposing the boron nitride nanomaterial to an oxidizing environment; and a mechanical shock imparting step of applying a mechanical shock for removing the boron grain(s) from the boron nitride nanomaterial that has undergone the oxidation treatment step, while the boron nitride nanomaterial is immersed in a solvent that dissolves the boron oxide.
Provided is a method for producing a TiAl intermetallic compound powder in which it is possible to reduce the number of internal pores. Also provided is a TiAl intermetallic compound powder in which internal pores have been reduced in number. This method for producing a TiAl intermetallic compound powder comprises passing a cutting chips of a TiAl intermetallic compound through a thermal plasma flame and performing a spheroidizing treatment. This TiAl intermetallic compound powder of which a cross section has a porosity of 0-0.4 area%. The TiAl intermetallic compound powder described above is suitable as a raw material powder for use in fabricating a molded article by various powder metallurgy methods and/or layer molding methods.
B22F 9/04 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
When a compressor vane or blade for an engine is used in an environment containing abundant foreign substances, deposits originated from the foreign substances are likely to deposit on surfaces of the vane. The compressor vane or blade according to the present disclosure has a base body of the compressor vane or blade; and a coating covering the base body, which consists essentially of one or more selected from the group of molybdenum disulfide and tungsten disulfide.
A compressor vane or blade for an engine used in an environment containing abundant foreign substances is provided which comprises: a base body of the compressor vane or blade; and a coating consisting of a nitride of titanium beyond 60 at% but less than 85 at% and a balance of silicon.
F04D 29/32 - Rotors specially adapted for elastic fluids for axial-flow pumps
F02C 7/00 - Features, component parts, details or accessories, not provided for in, or of interest apart from, groups ; Air intakes for jet-propulsion plants
There is provided a steel for solid oxide fuel cells which contains Zr and has a composition balance which allows a thin plate to stably obtain excellent oxidation resistance. The steel for solid oxide fuel cells contains more than 0 and not more than 0.05 mass% of C, 0.05 mass% or less of N, 0.01 mass% or less of 0, 0.2 mass% or less of Al, 0.15 mass% or less of Si, 0.1 to 1.0 mass% of Mn, 20.0 to 25.0 mass% of Cr, more than 0 mass% and not more than 1.0 mass% of Ni, 0.02 to 0.12 mass% of La, 0.1 to 0.5 mass% of Zr, 0.15 to 0.5 mass% of La + Zr, and Fe and impurities as a remainder. The following relational formula is satisfied, and an Fe and Zr-containing intermetallic compound viewed in a ferrite matrix is 1.1 mass% or less in terms of a visual field area ratio. 5(7C + 6N)/(7 - 4(7C + 6N))<= Zr <=41(7C + 6N)/(7 + 66(7C + 6N))
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
H01M 8/0202 - Collectors; Separators, e.g. bipolar separators; Interconnectors
H01M 8/1246 - Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
B21B 1/22 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling bands or sheets of indefinite length
This austenitic heat-resistant cast steel having excellent thermal fatigue characteristics contains, by mass, 0.30.6% C, 0.53% Si, 0.52% Mn, 1530% Cr, 630% Ni, 0.65% Nb, 0.010.5% N, and 0.010.5% S, wherein C/N is 47, and the remainder comprises Fe and unavoidable impurities. The ratio A/B, of the Cr carbide formation index A to the Nb carbide formation index B, is 0.61.7, wherein A is represented by formula (1): A=8.5C-Nb+0.05Cr+0.65Ni-5, and B is represented by formula (2): B=7.8Nb.
Provided are: steel for solid oxide fuel cells, which is capable of ensuring sufficient oxidation resistance even if a predetermined amount of nitrogen is contained therein; and a member for solid oxide fuel cells, which uses the steel for solid oxide fuel cells. This steel for solid oxide fuel cells having excellent oxidation resistance contains, in mass%, 0.022% or less (including 0%) of C, 0.01-0.05% of N, 0.01% or less (including 0%) of O, 0.15% or less (including 0%) of Al, 0.15% or less (including 0%) of Si, 0.1-0.5% of Mn, 22.0-25.0% of Cr, 1.0% or less (excluding 0%) of Ni, 1.5% or less (including 0%) of Cu, 0.02-0.12% of La and 0.01-1.50% of Zr with La + Zr being 0.03-1.60%, and 1.5-2.5% of W, with the balance made up of Fe and impurities. The ratio of Zr/(C + N) in mass% is preferably 10 or more.
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
H01M 8/1246 - Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
8.
STEEL FOR SOLID OXIDE FUEL CELL HAVING EXCELLENT OXIDATION RESISTANCE
Disclosed is steel for a solid oxide fuel cell, which has excellent oxidation resistance, good electrical conductivity and a thermal expansion coefficient similar to that of a ceramic component such as an electrolyte or an electrode by achieving a remarkable improvement of the oxidation resistance and a reduction in the evaporation amount of Cr. Specifically disclosed is steel for a solid oxide fuel cell, which has excellent oxidation resistance and contains, in mass%, 0.1% or less of C, 0.2% or less of Al, 0.2% or less of Si, 0.4% or less of Mn, 16.0-28.0% of Cr, 1.5% or less of Ni, 1.0% or less of REM and/or Zr in total, 1.0-3.0% of W, and more than 0.2% but 4.0% or less of Cu, with the balance made up of Fe and unavoidable impurities.
A method for producing a steel ingot, which comprises an Mg oxide forming step of preparing a molten steel containing Mg in an amount sufficient for the molten steel to have an oxide composition having MgO as a primary component and a dissociation step of keeping the pressure of the atmosphere around the molten steel to be lower than that in said Mg oxide forming step, to thereby dissociate MgO to Mg and oxygen and reduce the content of Mg in the steel to 50 % or less of that in the Mg oxide forming step through the diffusion thereof into a gas phase; and a preferred method further comprising a solidifying step, which comprises an Mg oxide forming step of preparing a first molten steel containing Mg in an amount sufficient for the molten steel to have an oxide composition having MgO as a primary component, a step of solidifying the molten steel, and a dissociation step of melting the resultant solid again under a pressure of an atmosphere lower than that in the case of the first molten steel, to thereby dissociate MgO to Mg and oxygen and reduce the content of Mg in the steel to 50 % or less of that in the above solid before re-melting through the diffusion thereof into a gas phase.
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